I know this is probably "old news", but I had exactly the same problem printing 2021 W2s as you are describing. I ordered the forms from Intuit, so I knew it wasn't a compatibility issue. I ended up following one of the recommendations I read here - download Adobe Reader and make it the default. That fixed it and the forms printed perfectly.  FYI - I had NO problem printing W-2s for the last 5 years - this was a new problem. Hope this helps.